Culpepper, 30, worked out in the afternoon before a gathering of Raiders scouts and coaches. The workout was private and Culpepper left without speaking to reporters, but Oakland coach Lane Kiffin announced the signing shortly after the Raiders completed practice.

"We had to see him run around, scramble and do different things because his arm didn't go away," Kiffin said. "We weren't really worried about that. We had to make sure everything else was good."

Culpepper began 2006 as Miami's starter but had trouble with his mobility and was sacked 21 times in the first four games. The Dolphins shut him down so he could continue rehabbing and eventually placed him on injured reserve. When they acquired Trent Green in a trade with Kansas City this offseason, Culpepper became expendable.

The Dolphins tried unsuccessfully to trade Culpepper a year after acquiring him from Minnesota. When Miami failed to find a team willing to trade for Culpepper, the former Pro Bowl quarterback was released on July 17. Culpepper met with Tampa Bay two days later but did not receive a contract offer from the Bucs.

The Raiders sent a member of their front office to Florida to work out Culpepper on Monday, then sent a private plane to fly the 6-foot-4, 265-pound quarterback to California for a workout today.

Culpepper's signing comes three months after the Raiders traded away his former teammate in Minnesota, Randy Moss.

In eight NFL seasons, Culpepper has passed for 21,091 yards and 137 touchdowns with 89 interceptions. He has a career quarterback rating of 90.8.

Kiffin acknowledged that the Raiders wanted Culpepper partially due to the situation with Russell. The No. 1 pick has yet to sign a contract with Oakland and negotiations between the two sides slowed over the weekend.

Josh McCown, who was acquired in a draft day trade with Detroit, and Andrew Walter have split the reps in practice while Russell remains at his mother's home in Mobile, Ala.

"We think that he adds definite competition to a position right now where we basically only had two guys here with Andrew and Josh," Kiffin said. "They've done extremely well but we needed to protect ourselves and make sure we're in the best position to win and make sure we have the most competition at that spot.

Kiffin spoke with Russell by phone this morning to brief the rookie on the possibility of Culpepper signing.

"Its always important for your team to know things, just as we informed both our quarterbacks last night that this was going to happen today (and) make sure they heard it from us and understood the reasons we were doing it," Kiffin said.

Raiders defensive tackle Warren Sapp spoke briefly with Culpepper today and welcomed the signing.